Machine for sharpening tools, especially those of tungsten-carbide



April 10, 195! A. A. MATHIEU MACHINE FOP SHARPENING TOOLS, ESPECIALLY THOSE OF TUNGSTEN-CARBIDE Filed Jan. 6, 1948 Fig. 2. P a

'I'II'IIIIIIII Patented Apr. 10, 1951 MACHINE FOR SHARPENING TOOLS, ESPE- CIALLY THOSE OF TUNGSTEN-GARBIDE Adelin Alfred Mathieu, Ensival, Belgium, assignor to Imperia, a Belgian company Application January 6, 1948, Serial No. 724 In Belgium October 30, 1942 Section 1, Public Law 690, August 8, 1946 Patent expires October 30, 1962 7 Claims. (01. 51-124) My present invention relates to a machine for sharpening tools, especially those of tungsten carbide, and its object is to provide the possibility of accomplishing on one machine equipped with only two grinding wheels: (01.) rough-shaping and finishing of tools of all forms and orientations, (b) rough-shaping and finishing of all types of chip breakers.

With a view to the realisation of this object, the invention consists essentially in that the machine comprises two tables oscillating in a horizontal plane, between which is situated a motor, the shaft of which carries on one end a finishing wheel and on the other end a roughing wheel, and which is mounted for vertical oscillation, the motor being locked and the tables unlocked for the sharpening operations, and the tables being on the contrary locked and the motor rendered free for the chip breaker operations.

In the practical realisation of the invention, the motor is mounted on a pendular suspension, making it possible to impart to the motor, without considerable efiort, a reciprocatory vertical movement. For this purpose, the motor rests on a support to which are hinged rods pivoted at fixed points to a frame and constituting an articulated system, the weight of which, with that of the motor and grinding wheels, is balanced by a spring of adjustable tension.

The accompanying drawing shows, by way of example, a machine constructed according to the invention.

Figs. 1 and 2 show the general arrangement of the machine, Fig. 2 being a section taken in the plane of the line IIII of Fig. 1;

Figs. 3 and 4 are intended to show the method of suspension of the motor, Fig. 3 being a section taken in the plane of the line IIL-III of Fig. 4.

As shown in the accompanying drawing, the machine according to the invention comprises a support I for two troughs 2 each containing a table 3 and a base 3 Both the table and base are provided with grooves 3g which are engaged by knife edge members 3 These knife edge members rest on the bases and support the tables for a horizontal reciprocatory movement of each table, in general pendular, as indicated by the arrows shown in Fig. 2. Each table may b fixed relatively to it base by means of a catch 4 engaging a recess 5.

Between the two troughs 2 is a motor 6 carrying on one of its shaft ends a roughing grinding wheel I and on the other end a finishing wheel 8. This motor is designed to rotate in both directions, and as the two oscillating tables are identical, the

tools can be roughed and finished in any orientation. This applies equally to the dressing of-the chip breaker which will be described hereinafter.

The motor 6 is in effect fixed to a support 9 to which are hinged at A andB rods l0 and l l which are in turn pivoted at D and C to a fixed frame I2 connecting the two troughs 2.

The whole support 9, rods [0, and frame l2 thus form a quadrilateral deformable at A, B, C, D, the two latter points bein fixed. The weight of this system, including that of the motor 6 and the grinding wheels, is balanced by a spring l3, the tension of which is adjustable by a screw [4.

There is thus provided a pendular suspension permitting the operator to .impart and to maintain, with the minimum efiort, a reciprocatory movement in a vertical plane.

If it is necessary to dress the chip breaker IS, the tool has merely to be presented as shown at I5 (Figs. 3 and 4). For this work, the oscillatin tables 3 must be locked and the motor must be released so that it can be given a pendular movement in the vertical plane.

If,'on the contrary, it is a question of sharpening work, the motor 6 has to be locked, for example by means of a catch I! engaging a recess I8 and. sliding in the frame at l9, so that the axis of the wheel is then fixed in space.

What I claim is:

1. In a machine for sharpening tools, a motor, the motor having a shaft, a support for the motor, a finishing wheel and a roughin wheel each car,- ried by an end of the shaft, two work tables ex.- tending at right angles with respect to the shaft and arranged so that the motor is situated between the tables, a base for each table, each table resting on its respective base by means of knife edge members to reciprocate horizontally, a pendular suspension for the support of the motor for vertical reciprocation, means to lock the motor support and to make it impossible for the motor to be displaced vertically while the tables may reciprocate for sharpening operations, and means to lock the tables relatively to their bases while the motor support may reciprocate for chipbreaking perations.

2. In a machine for sharpening tools, a motor, the motor having a shaft, a support for the motor, a finishing wheel and a roughing wheel each carried by an end of the shaft, two work tables extending at right angles with respect to the shaft and arranged so that the motor is situated between the tables, a base for each table, each table resting on its respective base by means of knife-edged members to reciprocate horizontally,

edge members to reciprocate horizontally,

a pendular suspension for the support of the motor for vertical reciprocation, means to lock the motor support and to make it impossible for the motor to be displaced vertically while the tables retain their capability of reciprocating for sharpening operations, and means to lock the tables relatively to their bases while the motor support retains its capability of reciprocating for chipbreaking operations, said pendular suspension comprising motor support, rods hinged to the motor support, and a frame, the rods being pivoted at fixed points of the frame and forming with the frame and motor support an articulated system.

3. In a machine as defined in claim '2, means for counterbalancing the weight of said articulated system.

4. In a machine for sharpening tools, a motor, the motor having a shaft, a support for the motor, a finishing wheel and a roughing wheel each carried by an end of the shaft, two work tables extending at right angles with respect to the shaft andarranged so that the motor is situated between the tables, a base for each table, eaeh'table resting on its respective base by means of knife a pendular suspension for the support of the motor for vertical reciprocation, means to lock the motorsupport and to'make it impossible for the motor to be displaced vertically while the tables retain their capability of reciprocating for sharpeni-ng operations, and means to lock the tables relatively to their bases while the motor support retains its capability of reciprocating for chip- 'breaking operations, said pendular suspension comprising motor support, rods hinged to the motor support, and a frame, the rods being pivoted at fixed points of the frame and forming with the frame and the motor support a deformable quadrilateral.

5. In a machine for sharpening tools, a motor, the motor having a shaft, a support for the motor, a finishing wheel carried by one end of the shaft, a roughing wheel carried by the other end of the shaft, two troughs each containing a work table extending at right angles with respect to the shaft and arranged so that the motor is situated between the tables, a base for each table, each table resting on its respective base by means of knife edge members to reciprocatehorizontally,

,a frame connecting the troughs, a pendular suspension for the support of the motor for vertical reciprocation, means to lock the motor support and to make it impossible for the motor to be displaced vertically while the tables retain their capability of reciprocating for sharpening operations, and means to lock the tables relatively to their bases while the motor support retains its capability of reciprocating for chip-breaking operations.

6. In a machine for sharpening tools, a motor, the motor having a shaft, a support for the motor, a finishing wheel carried by one end of the shaft, a roughing wheel carried by the other end of said shaft, two troughs each containing a work table extending at right angles with respect to the shaft and arranged so that the motor is situated between the tables, a base for each table, each table resting on its respective base by means of knife edge members to reciprocate horizontally, a frame connecting the troughs, a pendular suspension for the support of the motor for vertical reciprocation, means to lock the motor support and to make it impossible for the motor to be displaced vertically while the tables retain their capability of reciprocating for sharpening operations, means to lock the tables relatively to their bases while the motor support retains its capability of reciprocating for chip-breaking operations, said pendular suspension eomprising motor support, rods hinged to the motor support, and said-frame, the rods being pivoted at fixed points of the frame and forming with the frame and the motor support a deformable quadrilateral, and means to counterbalance the weight of said deformable quadrilateral together with the weight of the motor and grinding wheels.

7. In a machine as defined in claim 6, said counterbalancing means comprising a spring of adjustable tension.

ADELIN ALFRED MATHIEU.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

